A fully non-contact laser ultrasonic detection platform is constructed with laser excitation and laser Doppler scanning to achieve signals with high-resolution.A new temporal filter method with multiple frequency bands is proposed to decompose the laser broadband signal into multiple narrowband signals to suppress the dispersion effect, and then the damage signal is extracted without a reference signal.Based on this, the time reversal imaging method in f-k domain is used to reconstruct the incident wavefield and the scattering wavefield to determine the damage boundary, and then the damage imaging results of each narrow band signal are integrated to obtain more accurate imaging.The results of the numerical simulation and the experiment are compared to verify that the proposed detection method can achieve non-contact damage detection in isotropic plate-like structures, which has a wider application value in engineering practice.